Kett? Transformers Beast Wars: Beast Senshi Saiky? Ketteisen (??????????????????? ??????????? Kett? Toransuf?mâ B?sut? W?zu B?sut? Senshi Saiky? Ketteisen, lit. "Dueling Transformers Beast Wars: Strongest Beast Warrior Finals") is a video game for the Game Boy Color handheld. It was released by Takara on April 2, 1999 in Japan only, and is compatible with the game Transformers: Beast Wars Transmetals on the Nintendo 64 through the use of the Transfer Pak.

The main feature of the game consist of a single or two player battle, this includes elements similar to that of the Street Fighter series with basic moves and special attacks. Characters are presented in scaled down SD form. Since this is a Transformers game players will have the ability to transform from robot to beast at will. Each character has their own special attack. Akin to the Dragon Ball Z fighting game series player will have the ability to build their ki by holding down certain buttons.

There are bonus games consisting primarily of fun mini games that the player can play for extras. In the beginning the player will only have access to two of the extras in the extras menu. Players can access move mini games by earning code in Japanese which they enter in the password screen.